Synthesis and Improved Photoluminescence of SnF(2)-Derived CsSnCl(3)-SnF(2):Mn(2+) Perovskites via Rapid Thermal Treatment

We report a rapid synthesis method for producing CsSnCl(3):Mn(2+) perovskites, derived from SnF(2), and investigate the effects of rapid thermal treatment on their photoluminescence properties. Our study shows that the initial CsSnCl(3):Mn(2+) samples exhibit a double luminescence peak structure with PL peaks at approximately 450 nm and 640 nm, respectively. These peaks originate from defect-related luminescent centers and the 4T(1)→6A(1) transition of Mn(2+). However, as a result of rapid thermal treatment, the blue emission is significantly reduced and the red emission intensity is increased nearly twofold compared to the pristine sample. Furthermore, the Mn(2+)-doped samples demonstrate excellent thermal stability after the rapid thermal treatment. We suggest that this improvement in photoluminescence results from enhanced excited-state density, energy transfer between defects and the Mn(2+) state, as well as the reduction of nonradiative recombination centers. Our findings provide valuable insights into the luminescence dynamics of Mn(2+)-doped CsSnCl(3) and open up new possibilities for controlling and optimizing the emission of rare-earth-doped CsSnCl(3).